豚肉汚染大腸菌の薬剤耐性とそのRプラスミドについて

佐藤 昭子

doi:10.3358/shokueishi.18.328

豚肉汚染大腸菌の薬剤耐性とそのRプラスミドについて

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佐藤昭子

県立新潟女子短期大学

書誌事項

タイトル別名

Drug Resistance and R Plasmids in Escherichia coli Strains Isolated from Pork
ブタニクオセンダイチョウキンノヤクザイタイセイトソノ R プラス

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抄録

Investigation in relation to R plasmids was performed on 217 strains of drug resistant Escherichia coli isolated from 100 samples of ground pork in 1972 to 1974. Drugs tested were 7 kinds such as tetracycline (TC), chloramphenicol (CM), streptomycin (SM), sulfanilamide (SA), kanamycin (KM), ampicillin (APC) and nalidixic acid (NA). The results were summarized as follows; 1. Of 217 strains, about 95% were of multiple resistance, while the rest were of single resistance. 2. Among 217 strains, 104 (47.9%) strains were found to carry R plasmids. Especially, multiple resistant strains with APC resistance carried R plasmids at the frequency of about 86% to 100%. 3. The most frequent resistance pattern of R plasmids were multiple resistance. 4. Transmission frequency of R plasmids derived to E. coli K-12 ML1410 were about 10^-4 to 10^-6 per one donor. 5. Drug resistant E. coli strains carried two types of R plasmids i. e., fi^- R (20%) and fi⁺ R plasmid (80%).